Fly screen



June 10, 1952 J L 2,600,192

FLY SCREEN Filed Nov. 25, 1949 mvemoa JOHN BELL av mjwm ATTORNEYS Patented June 10, 1952 FLY SCREEN John Bell, Dalkeith, Australia Application November 25, 1949, Serial No. 129,335 In Australia June 2, 1949 4 Claims. (Cl. 160-372) This invention relates to improvements in fly screens.

The fly screens forming the subject of this application are adapted to slide up and down, and can therefore be used to protect the openings of so-called double hung windows, although they can be applied to other windows if desired, and can be used as screens in a stationary position.

Fly screens as at present constructed have certain disadvantages. One of these is the difficulty of applying the fly wire with a uniform tension so that it does not bulge and will have no unsightly appearance.

Another disadvantage resides in the difiiculty of fixing the tightened fly wire, which has a tendency to break away where attached.

It is an object of the present invention to provide fly screens which will overcome the above-mentioned drawbacks.

It is another object of this invention to provide a window screen, in which the wires can easily be tightened, while the screen itself is simple in manufacture and is easy to handle.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings in which:

Figure 1 is a front elevation of the complete window or fly screen;

Fig. 2 is a sectional elevation of a top corner of the window screen frame;

Fig. 3 is a sectional elevation of part of the top frame showing a modified arrangement with a resiliently stressed side;

Fig. 4 is an end sectional elevation of the top and bottom holding bars showing the method of attaching the screen wire, whilst Fig. 5 is a sectional elevation of a lower corner of the frame.

.As shown in these drawings, there is a crimping strip [0 at the top and at the bottom, each strip being formed of sheet metal or the like turned over about its longitudinal axis and having the wire crimped between the two folded parts. The wire II is then bent so as to run along one side of the folded crimping strip l0, then over the rounded top or bottom as the case may be, and then down to the other end where the other crimping strip holds the wire. The pull on the wire when tensioned is therefore on the rounded portion of the folded crimping strip I0, so that there is no possibility of cutting, and due to the method of crimping the wire and folding it, there is no possibility of it slipping out of position.

The frame holding the wire is of metal construction. It comprises two bars, one l2 at the top and the other l3 at the bottom. Each bar consists of the required length of metal folded so that one edge is turned in so as to have a hollow circular passage right through it, whilst the other end is turned up or down as the case may be to form a hook, which also extends for the full width of such bar. It is into the hook portions of these bars I2 and 13 that the crimp ing strips I0 holding the wire II are slipped. They are preferably placed so that the rounded part of the crimping strip [0 projects slightly above the hook ends of the bars I2 and I3.

Into each hollow end of each of the hook, bars l2 and I3 is slipped one leg of a right-angled rod member l4, l5, 16 or ll. To each of the free legs, that is the legs at right angles to the bars [2 and I3, is attached a hollow tube member l8. I9, 20 or 2|, as the case may be. Of these, two of them, l8 and [9, as shown in the drawings are internally threaded. Associated to operate with each of these threaded tubes is an elongated bolt 22 or 23, one end of which is formed with a metal thread 22 adapted to screw into the threaded portion l8 of tube l8 or I9, and the other end of which is hollow for some distance.

The remaining parts of the frame consist of two rods 24 and 25, one on each side, one end of each of such rods being slipped into a hollow tube member 20 or 2|, whilst the other end is slipped into the hollow of the elongated nut 22 or 23. When these parts are in position, then by screwing the elongated nuts 22 and 23, the effective length of each side of the frame is increased and therefore progressively tensions the fly wire held in the frame so constructed.

It will be obvious that the lower bar l3 may if desired have finger grips for raising the frame, but as these can be of any appropriate form, they have not been illustrated.

A frame constructed as described can be used for casement windows, in which case two frames will preferably be used, each slipping into channel runner sections screwed or otherwise attached to each side of the window frame. This, however, is not part of the invention. Actually the effect of screwing up the sides is slightly to bow them and this gives a resilient frictional contact against the channel runners.

The metal fly screen which has been described can be modified in the following respects.

Thus, in lieu of the means for increasing the effective length of the sides by means of the elongated nuts with screw threads co-acting with the other leg extending at right angles to these bars, is a convenient form of construction, I do not exclude the direct attachment or association of rods at right angles to each of the'bars [2' and I3, such as by welding or other means.

It will further be appreciated that whilstthe arrangement of elongated nuts with an extending male thread co-acting with threads in'the-hollow tube members l8 and I9 is satisfactory and convenient, and I believe the simplest way ofeffectin the'object aimed at, there are-obvious alternatives which are within thescope of the present'invention; Thus; the rod member M-and tube [8 could be one unit; at the free end providedei'ther with an internal female threador externally with a male thread co acting with 'an oppositely threaded elongated nut such as -22-.

Further, the bars l2 and-13" could-be corrugated in crosssection in that portion ofthem which is'between the bent-around part and the hook; as this will increase the strength and will in addition give a certain amount of-additional elasticity.

A' still further modification which in principle is quite the-same as the arrangement described will be toextend the free le'gs'of the rod members I6 and I! so that they are'adapted to slip into the hollows in the elongated nuts" "22 or 23. This will of course dispense with tube members and 2| and with'the separate-side rods 24 and 25.

I claim:

1. A window screenco'mprising in combination, a first member having tubularshap'ed'ends, a second member parallelwith 'butspacedfrom said first memberand also having tubular'shaped ends, a window screen having two opposite marginal edges attach'ed'to said members, a first' rod and a second rod arranged-inspaced parallel relatiorrin" the same plane as said first 'and'said second members, each of said rods having a central portion "extending perpendicular to said members and also havingiits end portions arranged perpendicular to said central portion; said end portions being lcicatedln" the adjacent tubu lar shaped e'ndsof said' first' 'a'nd said second members, and n'iale and female threaded'f-means associated with'each of said rods and respectively engaging" each 'cth'er-to facilitate adjustmentof the length of said 'r'odsg said screen lyingina plane that passes through-said rods andrnembers whereby the assembled unit -will seal about a wihdow "opening.-

2. A window screen comprisin m combination, a tfirst hollow hair, a second-hollow bar-spaced from and parallel with said first hollow bar, each bar-colnprising a portion extending toward'the other bar and bent-'backto form a 'u shaped channel, screen wire having-two marginaledges respectively secured in 'the' said channels of the said hollow ba'rsftwd U shaped' rod members spaced froin -each other, each of-sa'id members havingone le'g 'slipped into one end of each-of said :ho'll'ow rod members,- hollow tube meansree spectivelyass'ociated' with" each ofsaid rod mem- 4 bers intermediate said legs and each provided with an internal thread, and threaded means also respectively associated with said rod members and each engaging one of said internal threads thereby effecting adjustability of the length of said U-shaped rod members, said bars. rods, and screen being substantially co-planar so the assembled unit may seal within and about a window opening.

3. A window screen comprising in combination,

a=first bar having a recess at each end thereof,

a second bar opposite said first bar and spaced therefrom, said second bar also being provided *witharecess at each end thereof, a first L- shaped member having one end engaging one recess ofsaid firstb'ar, a second L-shaped member having one end engaging the adjacent recess of the other bar, means interposed between said two L-shaped members to vary the distance therebetween, a third L shaped member having one end in engagement with the other end of said first bar; afourth L-shaped member having one end in 'engagement withthe'otherend ofsaid second bar, means interposed between said last mentioned L-shape'd members to vary the distance thereb'e'tween, each'said bar being formed of a strip'rolled to a cylindrical formwith one edge extending out toward the other barand with the marginal-part of the edge bent back to form a'channelopening toward'thesa-id'bar, screening having U-shapedcrimping strips -on two opposite marginal edges; -and said strips being mounted in said channels with their open 1 sides toward the closed'sidesofsaid channels and with thescre'ening pass'ihgaround the closed sides of said clips.

4. A wind'ow'scree'n comprising in combination, a first bar having a 'recess at each of its ends,

7 a second bar arranged opposite and parallel with said first bar and likewise provided with arecess'atits'ends, an L-shapedmember'at each end of each'bar and each having 'one of its legs located in the adjacent one of said recesses, a memberextendingbetween theotherl'egs' of the corresponding L-sha'ped members to form a" rectangular frame and having at" least" its end 'p'arts' tubular to receivdthe said other legs, the last mentioned member including thre'aded'me'ans' for adjusting the length thereof to' change the s'ize of the said frame'in one direction, each said bar having a. portion extending toward the other'bar along 3 its entire length, each said portion being turned back'on itself to form-achannel opening toward the associated bar, screening having its opposite marginal edges in said channels; and means for clamping the said edgesin-said channels.

JOHN BELL.

"REFERENCES CITED Thefollowing references areof record in the file -of-this patent:

UNITED STATES PATENTS Augustine Dec. 24, 1-940 

